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-rw-r--r--coverage/summary.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/coverage/summary.py b/coverage/summary.py
index aed8335..20123ea 100644
--- a/coverage/summary.py
+++ b/coverage/summary.py
@@ -98,5 +98,6 @@ class SummaryReporter(Reporter):
if self.config.show_missing:
args += ("",)
outfile.write(fmt_coverage % args)
-
+ if not total.n_files:
+ raise CoverageException("No data to report.")
return total.n_statements and total.pc_covered